"NB" most commonly stands for the Latin phrase "nota bene," which translates as "note well" or "take special notice." It is typically used in writing to draw attention to something important or noteworthy. In modern usage, you might see "NB" placed before a critical detail or reminder.

In other contexts, "NB" can also stand for several things:

• "Non-binary," referring to a gender identity outside the traditional categories of male or female.

• "New Brunswick," a province in Canada.

• "Northbound" in travel directions.

• "Niobium," the chemical symbol for the element.

The meaning depends on the context in which "NB" is used, but its most well- known usage is as an abbreviation for "nota bene," indicating a point of emphasis in writing.